| Issue |
A&A
Volume 372, Number 1, June II 2001
|
|
|---|---|---|
| Page(s) | L5 - L8 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20010523 | |
| Published online | 15 June 2001 | |
Discovery of strong CIV absorption in the highest redshift quasar*
1
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
2
CAISMI-CNR, Largo E. Fermi 5, 50125 Firenze, Italy
3
Centro Galileo Galilei & Telescopio Nazionale Galileo, PO Box 565, 38700 S. Cruz de La Palma, Spain
Corresponding author: R. Maiolino, maiolino@arcetri.astro.it
Received:
16
March
2001
Accepted:
6
April
2001
We report the near-IR
detection of a prominent CIV absorption in the rest-frame UV
spectrum of the most distant known QSO, SDSS J104433.04-012502.2,
at 
.
This QSO was recently observed with XMM-Newton and it was found to be
notably X-ray weak.
The equivalent width
of the CIV absorption feature (~10 Å) strongly supports the
idea that the
X-ray faintness of this QSO is due to heavy absorption by gas with a column
density 
cm-2. The shape of the CIV feature suggests
that this is a Broad Absorption Line QSO. Although absorbed
by a huge column of gas, the observed continuum in the 0.9-2.4 μm range
(~1300-3500 Årest frame) exactly matches the template of
unabsorbed QSOs without invoking any reddening (
mag),
indicating that dust in the absorbing gas is either absent or composed of
large grains.
Key words: infrared: galaxies / quasars: general / quasars: absorption lines
Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the CNAA (Consorzio Nazionale per l'Astronomia e l'Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.
© ESO, 2001
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